南阳坡煤矿8800综放工作面临空小煤柱尺寸研究

Study on gob-side small coal pillars size of 8800 fully mechanized top-coal caving face in Nanyangpo Coal Mine

针对南阳坡煤矿8800综放工作面沿空掘进巷道临空小煤柱合理尺寸进行了深入、系统研究。基于关键层理论,构建临空煤柱顶板关键岩块铰接结构力学模型,数学推导煤柱承载应力,结合Bieniawski提出的煤柱强度线性计算方法,确定沿空掘巷临空小煤柱宽度为7m。采用相似实验模拟沿空掘巷临空7m小煤柱围岩的稳定性,并开展巷道表面位移现场观测试验,结果均较为理想,验证了8800综放工作面沿空掘巷留设7m临空小煤柱的可行性。为类似开采条件沿空掘巷临空小煤柱尺寸确定提供了参考和借鉴。

The reasonable size of small coal pillar is studied for gob-side roadway driving of 8800 fully mechanized top-coal caving face in Nanyangpo Coal Mine.Based on key strata theory,a mechanical model of key rock articulated structure in the coal pillar roof is established,and the coal pillar’s bearing stress is derived.According to the linear calculation method of coal pillar strength proposed by Bieniawski,the small coal pillar width in gob-side roadway driving is determined to be 7 m.Similar experiment is applied to simulate surrounding rock stability of 7 m small coal pillar in gob-side roadway driving,and field observation test of the roadway surface displacement is carried out.The both results are ideal,which verified feasibility of the7 m small coal pillar.